Earnings Per Share - Schedule of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income attributable to Werner	$ 29,881	$ 72,290	$ 65,105	$ 126,039
Weighted average common shares outstanding (in shares)	63,384	64,394	63,345	64,965
Dilutive effect of stock-based awards (in shares)	303	332	344	362
Shares used in computing diluted earnings per share (in shares)	63,687	64,726	63,689	65,327
Basic earnings per share (in dollars per share)	$ 0.47	$ 1.12	$ 1.03	$ 1.94
Diluted earnings per share (in dollars per share)	$ 0.47	$ 1.12	$ 1.02	$ 1.93